This briefing paper illustrates how Sustainable Development Goal (SDG) 3, Ensure Healthy Lives and Promote Well-Being for All at All Ages, is relevant to the specific health needs of lesbian, gay, bisexual, transgender, and intersex (LGBTI) people. The paper highlights existing data pertinent to the health and well-being of LGBTI people across seven targets within this Goal, as well as relevant data gaps. The paper then makes a series of recommendations regarding what type of data and indicators Member States should report in order to effectively monitor progress on LGBTI health needs and ensure implementation of SDG 3 is truly universal and in line with the SDGs principle of “leave no one behind.”